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Unformatted text preview: 1/22/10 1 84 Part of your overall grade (5%) is term work Comes in the form of on-line homework (eClass under the link Online Homework) First homework now available (until 23:59 Jan. 27) Read instructions/questions carefully! Units and number of digits Save your answers If you change an answer, save your answers again! Dont forget to Click Finish 1 hour to complete assessment from the time you start 2 attempts: Best score counts Rate 1 = k 1 [NO 2 ] 2 85 What can we say about the rates of the elementary steps? A) Step 1 faster than Step 2 B) Step 1 slower than Step 2 C) Rates of Steps 1 and 2 are equal D) Insufficient Information to know Rate 2 = k 2 [NO 3 ][CO] Inconsistent with overall rate law Consider: NO 2 (g) + CO (g) ! NO (g) + CO 2 (g) Overall rate law: Rate = k[NO 2 ] 2 Proposed mechanism: Step 1) NO 2 (g) + NO 2 (g) ! NO 3 (g) + NO (g) Step 2) NO 3 (g) + CO (g) ! NO 2 (g) + CO 2 (g) Same as overall rate law- slowest elementary step determines the rate of reaction...
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- Winter '10